Point-source and area-wide field studies of pyriproxyfen autodissemination against urban container-inhabiting mosquitoes

Suman, Devi Shankar; Farajollahi, Ary; Healy, Sean P.; Williams, Gregory M.; Wang, Yi; Schoeler, George B.; Gaugler, Randy

doi:10.1016/j.actatropica.2014.03.026

Cited by 41 publications

(61 citation statements)

References 15 publications

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“…Pyriproxyfen autodissemination in cryptic cups was consistently higher than open cups during the entire study period. Mortality in 2014 was comparable to previous autodissemination field experiments [30], though the pupal mortality in cryptic cups was relatively low to reach the desired level of effective control recommended by vector control authorities. Efficacy may have been underestimated because field samples were filtered to remove organic debris which likely reduced pyriproxyfen given this chemical’s propensity for adsorption to different substrates [31].…”

Section: Discussionsupporting

confidence: 66%

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Targeting a Hidden Enemy: Pyriproxyfen Autodissemination Strategy for the Control of the Container Mosquito Aedes albopictus in Cryptic Habitats

et al. 2016

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BackgroundThe Asian tiger mosquito, Aedes albopictus, is a vector of dengue, Chikungunya, and Zika viruses. This mosquito inhabits a wide range of artificial water-holding containers in urban and suburban areas making it difficult to control. We tested the hypothesis that female-driven autodissemination of an insect growth regulator could penetrate cryptic oviposition habitats difficult to treat with conventional insecticidal sprays.MethodologyOviposition preferences of Ae. albopictus females for open and cryptic cups were tested in semi-field experiments. Two conventional larvicidal sprayers were tested to determine droplet penetration and larvicidal efficacy in open and cryptic habitats using Bacillus thuringiensis var. israelensis (Bti) in the field. Finally, the efficacy of pyriproxyfen autodissemination stations was assessed in cryptic and open cups in residential areas during 2013 and 2014.Principal FindingsGravid females strongly preferred cryptic (53.1±12.9 eggs/cup) over open (10.3±4.3 eggs/cup) cups for oviposition. Cryptic cups showed limited droplet penetration and produced 0.1–0.3% larval mortality with a conventional backpack and low-volume sprays of Bti. The autodissemination stations effectively contaminated these cryptic cups (59.3–84.6%) and produced 29.7–40.8% pupal mortality during 2013–2014. Significant pupal mortality was also observed in open cups.ConclusionsThe autodissemination station effectively exploits the oviposition behavior of wild gravid females to deliver pyriproxyfen to targeted oviposition habitats. Although the pupal mortality in cryptic cups was relatively lower than expected for the effective vector control. Autodissemination approach may be a suitable supporting tool to manage Ae. albopictus immatures in the cryptic habitats those are less accessible to conventional larvicidal sprays.

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Section: Discussionsupporting

confidence: 66%

“…albopictus to deliver pyriproxyfen to larval habitats [12,14,30]. Attracted to the station by an oak infusion, the mosquito enters the station but is unable to reach the water and oviposit.…”

Section: Discussionmentioning

confidence: 99%

Targeting a Hidden Enemy: Pyriproxyfen Autodissemination Strategy for the Control of the Container Mosquito Aedes albopictus in Cryptic Habitats

et al. 2016

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“…Dissemination of pyriproxyfen led to over 90% larval mortality, and B. bassiana increased adult mortality compared with the control under laboratory conditions. However, sprayed applications of conventional pyriproxyfen formulation to treat tyres or vegetation were not effective in autodissemination and were affected by climatic conditions such as high rainfall . The autodissemination technique may be improved by the design of new contamination stations or by the development of specific pyriproxyfen formulations.…”

Section: Chemical Methodsmentioning

confidence: 99%

“…However, sprayed applications of conventional pyriproxyfen formulation to treat tyres or vegetation were not effective in autodissemination and were affected by climatic conditions such as high rainfall. 122 The autodissemination technique may be improved by the design of new contamination stations or by the development of specific pyriproxyfen formulations. Another possible approach, suggested by Bouyer and Lefrançois, 123 is to combine autodissemination with the sterile insect technique (SIT) (see Section 6.1) by releasing sterile males coated with pyriproxyfen in order to contaminate females during mating.…”

Section: Insect Growth Regulators As Chemical Larvicides: Direct Applmentioning

confidence: 99%

Control methods against invasive Aedes mosquitoes in Europe: a review

Baldacchino

Caputo

Chandre

et al. 2015

Pest Management Science

179

152

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Five species of invasive Aedes mosquitoes have recently become established in Europe: Ae. albopictus, Ae. aegypti, Ae. japonicus japonicus, Ae. koreicus and Ae. atropalpus. These mosquitoes are a serious nuisance for people and are also competent vectors for several exotic pathogens such as dengue and chikungunya viruses. As they are a growing public health concern, methods to control these mosquitoes need to be implemented to reduce their biting and their potential for disease transmission. There is a crucial need to evaluate methods as part of an integrated invasive mosquito species control strategy in different European countries, taking into account local Aedes infestations and European regulations. This review presents the control methods available or in development against invasive Aedes mosquitoes, with a particular focus on those that can be implemented in Europe. These control methods are divided into five categories: environmental (source reduction), mechanical (trapping), biological (e.g. copepods, Bacillus thuringiensis var. israelensis, Wolbachia), chemical (insect growth regulators, pyrethroids) and genetic (sterile insect technique and genetically modified mosquitoes). We discuss the effectiveness, ecological impact, sustainability and stage of development of each control method.

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“…The trial procedure was slightly modified from previous protocols [19–21]. The study was conducted for duration of 9 months at Dataran Automobil, Seksyen 15, Shah Alam.…”

Section: Methodsmentioning

confidence: 99%

Small-scale field assessment of efficacy of the autodissemination approach against Aedes sp. in an urban area

Ngesom¹,

Othman

Bahauddin³

et al. 2020

Preprint

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This is the first study to evaluate the efficacy of an autodissemination approach, as suggested by WHO. Therefore, the efficacy of an autodissemination approach in small-scale field trials against wild Aedes sp. population was evaluated in an urbanized setting, Malaysia. Lethal ovitraps enhanced with pyriproxyfen were used to control Aedes sp. populations at treatment sites, with the autodissemination activity was assessed using the WHO larval bioassays. Lethal ovitraps enhanced with pyriproxyfen effectively reduced of Aedes sp. population. All autodissemination stations were shown to be visited by Aedes sp. mosquitoes with 100% complete inhibition against eggs and larvae development. In the larvae bioassay, pupae mortality ranged from 14 to 40%. Statistically, a significant reduction of Aedes sp. population in the treatment sites compared to the untreated areas. The study proved for the autodissemination of pyriproxyfen to breeding habitats by wild Aedes sp. This technique is highly potentially for vector control activities. Future evaluation should focus on large-scale field trials.Author SummarySince 2012, Dataran Automobil, Seksyen 15, Shah Alam, was declared as one of the dengue hotspot areas. Major vector control activities were conducted by government, NGOs, social communities, and local authorities, but the number still rising. We conducted a new invention of autodissemination concepts in this area by an entomological study on mosquito populations reduction and dispersal abilities of the technique. We found that the technique has proven to control mosquito populations, but the other factors such as epidemiology link still unclear and need further clarification. Our finding highlighted the effectiveness of autodissemination strategies that can be considered as one of the alternative tools in vector control programme.

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Point-source and area-wide field studies of pyriproxyfen autodissemination against urban container-inhabiting mosquitoes

Cited by 41 publications

References 15 publications

Targeting a Hidden Enemy: Pyriproxyfen Autodissemination Strategy for the Control of the Container Mosquito Aedes albopictus in Cryptic Habitats

Targeting a Hidden Enemy: Pyriproxyfen Autodissemination Strategy for the Control of the Container Mosquito Aedes albopictus in Cryptic Habitats

Control methods against invasive Aedes mosquitoes in Europe: a review

Small-scale field assessment of efficacy of the autodissemination approach against Aedes sp. in an urban area

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